{"refrec":{"BRefID":337891,"RR":"<b>Voarintsoa, N.R.G.; Barkan, E.; Bergel, S.; Vieten, R.; Affek, H.P.</b> (2020). Triple oxygen isotope fractionation between CaCO<sub>3</sub> and H<sub>2</sub>O in inorganically precipitated calcite and aragonite. <i>Chem. Geol. 539</i>: 119500. <a href=\"https://hdl.handle.net/10.1016/j.chemgeo.2020.119500\" target=\"_blank\">https://hdl.handle.net/10.1016/j.chemgeo.2020.119500</a>","BEntID":334515,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Chem. Geol. 539</i>: 119500. <a href=\"https://hdl.handle.net/10.1016/j.chemgeo.2020.119500\" target=\"_blank\">https://hdl.handle.net/10.1016/j.chemgeo.2020.119500</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Voarintsoa, N.R.G.; Barkan, E.; Bergel, S.; Vieten, R.; Affek, H.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Voarintsoa, N.R.G. <i>et al.</i>","Englishabstract":"Carbonate bearing materials, such as foraminifera, mollusks shells, or speleothems, have the potential to preserve geochemical and isotopic signatures reflecting the environmental conditions at the time they formed. Beyond the conventional δ<sup>18</sup>O, information from triple oxygen isotopes (reported as <sup>17</sup>O<sub>excess</sub>, which is defined as (ln (δ<sup>17</sup>O/1000 + 1) − λ<sub>ref</sub> ln (δ<sup>18</sup>O/1000 + 1)) × 10<sup>6</sup>) in these archives promises to be a valuable tool to reconstruct past hydrological processes. The goal of this study is to determine the triple oxygen isotope fractionation between CaCO<sub>3</sub> and H<sub>2</sub>O under well-constrained laboratory conditions. We performed laboratory experiments to precipitate CaCO<sub>3</sub> polymorphs, either calcite or aragonite, at temperatures between 10 and 35 °C. We then evaluated the effect of polymorphism, temperature, and solution concentration on the <sup>17</sup>O<sub>excess</sub> of CO<sub>2</sub> extracted from these carbonates and the <sup>17</sup>O isotopic fractionation (<sup>17</sup>α) between water and CaCO<sub>3</sub>. The obtained values of <sup>18</sup>α and <sup>17</sup>α between CO<sub>2</sub> extracted from CaCO<sub>3</sub> and parent water allow us to calculate the fractionation slope θ (=ln<sup>17</sup>α/ln<sup>18</sup>α). Our observations suggest that θ is indistinguishable at temperatures of 10 and 27 °C, but is slightly lower at 35 °C. The lower value at 35 °C may be related to disequilibrium during these experiments. We found that θ is independent of polymorph and of solution concentration, indicating that <sup>17</sup>O<sub>excess</sub> is less sensitive than δ<sup>18</sup>O to these geochemical parameters and can thus be a robust proxy for reconstructing <sup>17</sup>O<sub>excess</sub> of parent water.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Triple oxygen isotope fractionation between CaCO<sub>3</sub> and H<sub>2</sub>O in inorganically precipitated calcite and aragonite","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-19 01:32:11.361094","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Triple oxygen isotope fractionation; Calcite-Aragonite; O-17(excess); Paleo-hydrology proxy","OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2021-05-31","DateCreate":"2021-05-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000521131500009","VABBcode":null,"OpenAcc":0,"Handle":"10.1016/j.chemgeo.2020.119500"},"refs":null,"anarec":{"AnaID":337891,"PubliDate":2020,"Pagination":"119500","XtraPublOfAnaID":null,"ISBN":null,"Volume":"539","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42560,"SerRR":"Chemical Geology. Elsevier: New York; London; Amsterdam.  ISSN 0009-2541; e-ISSN 1872-6836","StandardTitleSer":"Chemical Geology","ISSN":"0009-2541","AbbrevSer":"Chem. 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